Sylvania



Nov;2,1926. Re. 16,457

J. o. YoDER WATER TREATING PROCESS AND APPARATUS OriginaI FiIed May a, 1920 IN V TOR BY i 52;

7 4 ATTORNEY Reissued Nov. 2, 1926.

UNITED YSTATES PA NT] OFFICE.

. JOSEPH D. YODER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 COCHR-ANE CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

WATER-TREATING rnoonss AND APPARATUS.

Original No. 1,402,277, dated January 3, 1922, Serial No. 379,700, fi1ed May 8, 1920. A pplication for' My invention relates to water treating ap aratus and process, and more particular y to apparatus and process for softening and filtering water to be used in steam boilers.

My invention resides in water treating apparatus of the character referred to com prising a sedimentation or treatlng tank,

- means for feeding water andsoftening reagent or a mixture of the two to'the sedimentation tank, a filter, piping connections for conveying softened and settled water to the filter for -filtration therethrough,.and piping connections for conveying water. from. the sedimentation tank for washing the'filter.

My invention resides further in apparatus of the character referred to, comprising a novel "arrangement of the filter wash water piping connections, whereby water for washing the filter may be withdrawn from the sedimentation tank, while softened and settled water for supplying a steam boiler is also withdrawn therefrom atthe usual rate, without disturbin the normal effective operation of the sedlmentation tank.

My invention resides further in apparatus of the character referred to whereinthe water employed for washing the filter may be returned to the treating tank.

' My invention resides furtherin process for treating water wherein water for washing-a filter is withdrawn from the treating tank without affecting the normal effective operation of the treating tank.

My invention resides further in a process of treating water whereih water withdrawn from a treating tank efter nse for washing a filter'is returned to the treating tank.

My invention resides further in the apparatus and process hereinafter described.

For an illustration of one form which my invention may take, reference is to be had to the accompanyitig drawing, in which the figure is a front elevation with parts in section. 7

Referring to the drawing, 1 is a treating tank of any desired size and Shape, and is preferably a vertically disposed cylindrical tank of greater length than is the diameter. The tank 1 isprovided with a bottom 2, .preferably.. -conical..in, form, having at its lower .end or vertex, a valve 3 for the withdrawal of sludgeand sediment. Tank 1 rests upon reissue filed May 11, 1923- Serial No. 638,410.

a foundation 4. Valve 3 is provided with operating rod 5, which extends beyond the wall of foundation 4. l I

On the top of tank 1 is a cover 6, carry-' ing the water heater7. Heater 7 is shown as an open type heater operating, with expipe 8, but any type of heater other than e0- haus't steam supplied through exhaust steamthe form shownmay be employed, and the 1 heater may be omitted, or may be separate from the treating tank.

Leaving the top of the heater 7 is a vent pipe 9, and entering the heater are the softening reagent supply pipe 10 and raw water supply pipe 11. receives softening reagent in correct measa Reagent supply pipe 10 ured quantity from any suitable supply means (not shown). pipe 11 is controlled by hand valve 12 and automatic valve 13, the latter operated by float 14 in the top of the tank 1 and connected therewithby means of levers in well Raw water supply known manner,'so that as thelevel of water in tank 1 rises and falls, valve 13 is closed and opened, respectively,'whereby a substantially constant water level is maintained in tank 1'. 1 Tank 1 is provided with water test cook 15 adjacent the upper end thereof, sludge test cook 16 adjacent the lower end thereof,

a manhole 17 and an extension thermometer 18 connected with the tank at any desired I 1 point, as for example, in the middle pdrtion of the tank. Within tank lis the up-take chamber 19, here illustrated as conical and havingits open or larger end spaced a short distance from the bottom of tank 1. 1pmfera conical up-take chamber, but it is to be understood that my invention is not limited thereto, as other forms of up-take chamber, such as a cylindrical or tubular chamber extendin from the to to adjacent the. bottom of tank 1, or-'-a cy 'ndrical chamber open at the bottom and closedat the top.

may be employed. y

Leading from the upper end or vertex of the up-take chamber'l9 is a'pipe .20. extending laterally througli' the wall of tank land 2 connecting with filter 21,-as hereinafter described. Extending vertically frome-pipe- 20, pipe 22 connects with overflow box- 23, which communicates through pipes24 and 25 with the top of tank 1 and to the heater 7, respectively; -The pipe 24 serves to convey oil from the oil separating'chamber of heater 7 to the overflow chamber, while pipe serves to equalize the pressure between tank 1 and the overflow chamber. The overflow chamber discharges to waste through the water seal formed by pipes 26, 27, 28, 29 and 30.

' Spaced from the bottom of filter 21 is a diaphragm 31 provided with strainer valves 32 and carrying the filter bed 33, of gravel and sand. 1 The bottom of filter 21 below diaphragm 31 communicates through T 36 and pipe 37, controlled by valve 38, with pipe 39, controlled by valve 40; pipe 39 connecting through T 41 with pipe 20. The bottom of filter 21 also communicates through T 36 with pipe 42, controlled by valve 43, con ,nected to the pressure side of pump 44; the intake of pump 44 connecting through pipe of tank 1. The pipe 45 enters tank 1 at a point above the lower end of up-take chamber 19 and below the top of tank 1, as and for the purpose hereinafter described.

Pipes 37 and 39 connect through T 47 with pipe 48, which leads to the boiler feed pump or other means to be supplied with softenedor softened and filtered water (not shown). The pipe 37 is provided with a pressure gauge 49, and Ts 41 and '47 are provided with test cocks 50 and 51, respectively.

The upper end of filter 21 above the filter bed 33 is provided with an air vent pipe 52 and connects through the cross connection 53-and pipe 54, controlled'by valve 55, with the top of tank 1. Cross connection 53 also connects through pipe 56, controlled by valve 57, with T 41, and through pipe 58, controlled by valve 59, to waste.

Pipes 54 and 45 are preferablyconnected to treating tank 1 at opposite sides thereof, so that the greatest possible quantity of wa ter may be withdrawn from tank l through pipe 45 before wash water returned to tank 1 by pipe 45 reaches the intake of pipe 45.

his arrangement is, however, not essential, and pipes 54 and 45 may join'tank 1 in any desired relation to each other around the circumference thereof.

The operation is as follows:

Raw water andsoftening reagent are supplied through pipes 10 and 11 to the heater 7, where they mix and are heated by exhaust steam supplied to the heater through pipe 8. The hot mixture of water and softening reagent falls into the top of tank 1 and flows downwardly therein. During the progressv of the water and softening reagent downwardly in tank 1. the water is softened and a precipitate produced which tends to settle to the bottom of tank 1. .The softened water carrying precipitate and suspended solid matter fiows under the lower edge of up-take chamber 19 and upwardly therein then to pipes 20 and 56 into the top of filter 21 45, controlled by valve 46, with the inside through filter bed 33, and discharges through under the edge ofchamber 19 and upwardly therein, the greater portidn of the sus ended solid matter therein settles downwar ly and falls to the bottom of the tank 1, from which it is withdrawn periodically through valve 3.

This separation of solid matter occurs princi-' pally near the lower edge of chamber 19. The size of the apparatus is proportioned to the amount of water to be treated to produce the desired rate of flow in tank 1 and chamber 19 and the resulting desired degree of sedimentation therein.

For washing filter 21, valves 57 and38 are closed and valve 40 opened, whereby softened and settled water passes directly from chamber 19 tothe point offsupply. This water, by-passed around filter 21, will contain some solid matter not settled out in tank 1, and if desired, may be passed through another filter. While valves 57 and 381 are closed, valves 46 and 43 are opened and pump 44 is operated to draw water from bed 33 and wash the'same. The wash water, after passing through filter bed 33, may be delivered through pipe 54 back into the top of tank 1, or it may be delivered throug pipe 58 to Waste. The wash wat r, after.

passing through filter bed 33, will carry com-,

paratively large quantities of' suspended solid matter, and if expedient, this water may be wasted as stated. However, I prefer to deliver it into the top of tank 1 wherein most of the suspended solid matter separates by sedimentation as above described and the softened water is saved.

In washing the filter as above described, softened water is withdrawn from tank 1,

passed through the filter, and returned to the top of tank 1. I The water so returned to the top of tank 1 contains a lar e of suspended solid matter washed from the filter bed. If pi e 45 were connected to tank 1 near the wor ring water level, the water containing large amounts of suspended solid matter returned to tank 1 from filter 21 would be returned to the filter and continue to circulate between filter 2-1 and tank 1 durin the washing operation; and the cleansing of the filter would not'be efiicient. Pipe 45 is therefore connected to tank 1 at a suliicient distance below the working Water level therein that the wash water returned to tank 1 from filter 21 will not reach the intake of pipe 45 until after the washing operation is complete. water containing only the normal quantity of suspended solid matter is supplied to the filter for washing purposes.

As pointed out above, a large proportion of thesuspended solids separate from the water by sedimentation in tank 1. The efl'iciency of the sedimentation depends upon quantity I In this way clean the rate of ,flow of water downwardly in tank 1, under the edge of chamber 19 and upwardly in the chamber, and principally upon the rate of flow around the edge of the chamber, and for continuous and efiicient operation this rate of flow around the edge of the chamber, must not be increased materially, The pipe 45 is therefore connected to tank 1 at a substantial distance above the lower edge of chamber 19, where the rapid withdrawal of water for washing the filter will not affect the rate of flow under the edge of chamber 19. The rate of flow of water downwardly intank 1 from the top thereof to the point. of connection of pipe 45 is increased by withdrawal of water 3 through pipe 45 for washing purposes; but this part of tank 1 is not primarily effective for removing suspended solids from the water, and the efi'ective sedimentation of solids from the water is not materially interfered with by the withdrawal of water through pipe 45 positioned with relation to the lower edge of chamber 19 "asstated. By the above arrangement water of sub-.

stantially uniform suspende solid content isdelivered from chamber 19 through pipe 20, and the uniformity of the water so delivered is not affected during the washing of the filten- K WhatIclaimis:

1. Water treating apparatus comprising a treating chamber, means for supplying water to one end of said'treating chamber, an up- 85 take chamber within said treating chamber and forming a part thereof, a filter, means for withdrawing water from said up-take chamber and passing said water through said filter,' a connection with said treating chains 40 her intermediate the ends-thereof and independent of said last named means for supplying wash water to said filter, and a connection for conducting the wash water back to said chamber.

2. \Vater. treating apparatus .comprisinga treating tank, means for supplying water to the top of said treating tank, an lip-takechamber within said treating tank having an open end adjacent but spaced from the bottom of said treating tank, a filter, a pipeconliecting a section of said up-take cham ber remote from said open end with one side of said filter, and a pipe connecting a sec- I tion" of said treating tank ,remote from said o 11 end of said up-take chamber and out @Qsiilde thereof withthe opposite side of said ter. J 1

3. Water treating apparatus comprisin a treating tank, an up-take ,cl amber .wit in- 50 and forming'a part of said treating tank, a

filter, meanxfo'r conveying water from the upper end of said up-take chamber through said filter in one direction. means for conveying water from said treating tank through said filter in the opposite direction,

and means for conveying said last named water from said filter to said treating tank; 4.. Water treating apparatus comprising a treating tank means for supplying water into the top of. said treating tank, an up-take chamber within said treating tank and communicating with the lower end thereof, a filter, a conduit connecting said up-take chamber with said filter, means for removing filtered water from said filter, a conduit communicating with said treating tank interme-' diate the working water level and [the intake end of'said up-take chamber for sup-' plyin wash-water to ,said filter, and a conduit%or returning said wash water to said treating tank.

5. The process'of treating water, which consists in flowing a stream of water and softening reagent downwardly through a treating chamber and upwardly through an up take chamber, drawing water 'from said stream of water in said treating chamber before it reaches said up-take chamber and washing said filter therewith, and returning the 'filter wash water to said treating tank. 6. Water softening apparatus comprising a treating tank, a water heater delivering into said treating tank, means for supplyin water and softening reagent in re ulated uantities tosaid treating tank, a funnels aped up-take chamber in the lower end of said treating tank having its larger end open and directed toward the bottom of said treating tank, a filter, a conduit for directing water from said up-take chamber and 'downm0 wardly'through said filter, a filter by-passcommunicating with said conduit, means for drawing water from said treating tank at a point below the working water level in said treating tank and above said open end of said up-takechamber and passiiig' it upwardly through said filter, and conduits for conveying said wash water back to said treating tank and to' waste, respectively.

7, Water treating apparatus comprising a treating tank, an up-takechamber communicating with the lower end of said treating tank, means for supplying water and softening reagent to the top of said treating tank,

a filter, a conduit connecting said up-take chamber with said filter, a conduit for withdrawingiwater from said treating tank at a point between the working water level in said treating tank and the intake end of said uptake ehamber for washing said filter,

whereby the rate of flow of water into said up-takeichamber isnot increased and the quantity of water in said treating tank betweerT the point at which said conduit withdraws water and the workingwaterdevel in said treating tank is greater than that re-' quired to wash said filter, and means for returning wash water from said filter into the top of said treating tank. i

8. Boi

ler feed water softening apparatus comprising a treating chamber,an up-take chamber .within said treating chamber forming a part thereof, a filter, means for withdrawing water from said treating chamber and passing it through said filter, means for withdrawing water from said treating chamber and assing' it in reverse direction .through said filter, and means for returning for returnin I treating tail water from said filter to the top of said treat ing chamber. L

9. Water softening apparatus comprising a treating tank, water heater on top of said treating tank, an up-take chamber withg in said treating tank,- a filter, means for withdrawing water from said up-take chamber and passing it through said filter in' one a direction, means for with rawing water from said treating tank and passing 't through said filter in the reverse direction, nd means said last named water to said 10. Water treating apparatus comprising a treating tank, means for supplying water and softening reagent into the top'o f said treating tank, an up-take chamber Within said treating tank, a -filter,a pipe for withdrawing water from said up-take chamber and passing it to said filter, a conduit commumcating with said treating tank remote from the upper end thereof for supplying water to said filter, a conduit connecting said filter with the upper;end of said treating tank, said conduits connecting with said treating tank on opposite sides thereof.

11. Water treating apparatus comprising a treating chamber, an up-take, chamber within said treating chamber, said up-take chamber extending from adjacent the lower end of said treating chamber and terminating remote from the upper 'endof said treating chamber, 'a filter, a-conduit connecting the upper end of said up-take chamber with t-hegnormal inlet side of said filter, and a second conduit connecting said treating chamber outsideofv said up-take chamber.

- with the normal outlet side of said filter for reverse washing thereof.

. 12. Liquid treating apparatus comprising a settling chamber, a chamber for receiving liquid from .said settling chamber, a filter,

I -means for conveying li uid from said receiving chamber throng said filter, and means for directing liquid from said settling chamber throu h said filter and back to said settlingcham er, a

13. Liquidtreating apparatus comprising asettling chamber, a chamber for receiving liquid from said settling chamber, a filter,

"means for conveying liquid from said receiving chamber through said filter in one directlon, and means for directing liquid from said settling chamber through said filter in the reverse direction and back to said settling chamber.

14. Liquid treating apparatus comprising a plurality of connected chambers through which liquid may flow, a filter, means for directing liquid from one of sand chambers through said filter in, one direction, and means for directing liquid from a chamber in advance of said last named chamber through said filter in the reverse direction and back to a chamber'in advance of the said last named chamber.

comprises passing a through afitreating chamber, thence through a receiving chamber, withdrawing liquid from said stream before it reaches said receiving chamber and washing a filter there-- stream. c

16. The method of treatin liquid, which comprises passing a stream 0 liquid through a treating chamber, thence through a receivwith, and returning said wash liquid to said .ing chamber and a filter in one direction,

15. The method of treating liquid, which stream of liquidwithdrawing liquid from said stream before it reaches said receiving chamber and directing it through said filter in the reverse direction, and returning said withdrawn liquid to said stream.

17. The method of treating liquid, which comprises passing a stream of liquid through a treating chamber and thence through a receiving chamber into a conduit leading therefrom, and simultaneously with-.

drawing liquid from said stream before it reaches sai receiving chamber and directing it through a; filter in a direction the reverse of that taken by liquid passing there through from said conduit in the normal. j

A J OSEPH D. YODER. 

